llvm-project

71653467 - [MemorySSA] Allocate MemoryUse and MemoryDef with a bump allocator (NFC) (#236419)

[MemorySSA] Allocate MemoryUse and MemoryDef with a bump allocator (NFC) (#236419) Update MemorySSA to use BumPtrAllocator to allocate MemoryUse and MemoryDef. This improves compile-time vs using system allocators: stage1-O3: -0.11% stage1-ReleaseThinLTO: -0.15% stage1-ReleaseLTO-g: -0.08% stage1-aarch64-O3: -0.13% stage2-O3: -0.12% stage2-clang: -0.09% https://llvm-compile-time-tracker.com/compare.php?from=a6e37c55c604be1db6e4096fc2cc758972fe7868&to=d1ff4b406dfe3673de36d1acca6a1e4cff112f3c&stat=instructions:u The initial slab size is relatively small to avoid increasing peak memory use for modules with lots of small functions. Assisted-by: Opus 5.5 PR: https://github.com/llvm/llvm-project/pull/236419